Dental mold flask

Abstract

The invention relates to a dental mold flask (10) for production, in particular for injection molding, of dental molded parts, with at least two mold shells (12) via which a mold cavity (14) can be formed for introduction of polymerizable plastic through a filling channel (16), and with an air release channel (42) for the air that escapes during filling of the mold cavity (14). The air release channel (42) has a filter element (40) whose permeability for air changes automatically, in particular decreases, as soon as it comes into contact with the polymerizable plastic.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims foreign priority benefits under 35 U.S.C. §119(a)-(d) from German patent application ser. no. 10 2006 041 790.9 filed Sep. 6, 2006. TECHNICAL FIELD [0002] The invention relates to a dental mold flask for production of dental molded parts, and more particularly for injection molding of dental molded parts, with at least two mold shells via which a mold cavity can be formed for introduction of polymerizable plastic through a filling channel, and with an air release channel for the air that escapes during filling of the mold cavity, which flask serves in particular as an injection mold and, for this purpose, has two mold shells that can be pressed onto one another. BACKGROUND OF THE INVENTION [0003] Dental mold flasks for the production of dental molded parts have been known for a long time. Such molded parts are often produced as precision-molded parts from a polymerizable plastic which is introduced into the mold ...

AI Technical Summary

Benefits of technology

[0007] Accordingly, the object of the present invention is to make available a dental mold flask which permits better handling and versatile use.

[0014] However, the filling channel is preferably provided with an insulator, which ensures that the plastic material introduced there is not immediately heated. This allows the heating to be done over a large surface area and not in a fixed location, so that a filter element that is not especially resistant to temperature can also be used. The insulator then prevents a rapid temperature increase in the filling channel, so that only the mold cavity is hot and, during the curing, a further pressing is effected by the injection molding operation. The quality of the molded part obtained in this way is significantly better, especially when polymethyl methacrylate is used as a main constituent for the polymerizable plastic.

[0015] The filter element is preferably connected via the air release channel to a suction device which generates an underpressure. In this way, it is possible to reduce the molding pressure for provision of the plastic by just under 1 bar, for example.

[0016] The filter element can be provided at any desired location in the air release channel. However, it is preferably spaced apart slightly, for example by about 1 cm, from the mold cavity in the air release channel. In this way, it is also possible to ensure that the polymerizable plastic cannot be contaminated by the filter element.

Problems solved by technology

This is awkward and slows down the production of the prosthesis or of the other molded dental part.

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